標題: The versatile designs and optimizations for cylindrical TiO2-based scatterers for solar cell anti-reflection coatings
作者: Lin, Albert
Zhong, Yan-Kai
Fu, Sze-Ming
電子工程學系及電子研究所
Department of Electronics Engineering and Institute of Electronics
公開日期: 4-十一月-2013
摘要: The anti-reflection coating(ARC) based on dielectric nanoparticles has been recently proposed as a new way to achieve the low reflectance required for solar cell front surfaces. In this scenario, the Mie modes associated with the dielectric nano-particles are utilized to facilitate photon forward scattering. In this work, versatile designs together with systematically optimized geometry are examined, for the ARCs based on dielectric scatterers. It is found that the Si3N4-TiO2 or SiO2-TiO2 stack is capable of providing low reflectance while maintaining a flat and passivated ARC-semiconductor interface which can be beneficial for reduced interface recombination and prevent V-OC degradation associated with topography on the active materials. It is also confirmed that the plasmonic nano-particles placed at the front side of solar cells is not a preferred scheme, even with thorough geometrical optimization. At the ultimate design based on mixed graded index(GI) Mie-scattering, the averaged reflectance can be as low as 0.25%. Such a low reflectance is currently only achievable by ultra-long silicon nano-tips, but silicon nanotips introduce severe surface recombination. On the other hand, the mixed GI Mie design preserves a flat and passivated ARC-silicon interface, with total thickness reduced to 279.8nm, much thinner than 1.6 mu m for silicon nanotips. In addition, the light trapping capability of mixed GI Mie design is much better than silicon nanotips. In fact, when compared to the state-of-art TiO2 light trapping anti-reflection coating, the mixed GI Mie design provides same light trapping capability while providing much lower reflectance. (C) 2013 Optical Society of America
URI: http://dx.doi.org/10.1364/OE.21.0A1052
http://hdl.handle.net/11536/23275
ISSN: 1094-4087
DOI: 10.1364/OE.21.0A1052
期刊: OPTICS EXPRESS
Volume: 21
Issue: 22
起始頁: A1052
結束頁: A1064
顯示於類別:期刊論文


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  1. 000327007800015.pdf